Callose deposits impeded cellular penetration at site of infection, strengthen the cell wall and block of plasmodesmata. Hi, on OCR bio A are we supposed to learn the difference between cell-mediated immunity and humoral immunity? Jump to... Plants and photsynthesis Biology GCSE 9-1. Pathogens . Classification. Vectors__ __- organisms that carry the disease between hosts such as mosquitoes for malaria 4. 4.1.1 therefore gives teachers a chance to reinforce earlier theory and skills e.g. Our own antigens are recognised as ‘self’ by the immune system and do not provoke a response, Antibodies are immunoglobins (complex proteins produces by the plasma cells) and are released in response to an infection, they have a region with a specific shape to the antigen, antibodies attach to antigens and render them harmless, 4x polypeptide chain, 2x light chains & 2x heavy chains, The tips of the y are the variable region but is the same for every type of antibody, A group of antibodies that bind to pathogen antigens and then act as binding sites for phagocytic cells, Some are produced as part of a specific immune response and bind to specific antigens. An infectious disease is a disease resulting from the presence of pathogens including viruses, bacteria, fungi, protozoa and multicellular parasites. Learn vocabulary, terms, and more with flashcards, games, and other study tools. A-Level Biology does pretty much what it says on the tin. Its active ingredient was found to reduce the side effect of stomach bleeding by adding an acetyl group which lead to the development of aspirin and ibuprofen, Monkeys, bears and other animals rub citrus oils on their coats as insecticides and antiseptics to prevent insect bites and infection. Passive immunity – immunity achieved when antibodies are passed to the individual through breast feeding or injection, Antibiotic – a chemical which prevents the growth of microorganisms, can be antibacterial or antifungal, Personalised medicine – development of designer medicines for individuals, Synthetic biology – re-engineering of biology, from the production of new molecules that mimic a natural process to the use of natural molecules to produce new biological systems that do not exist in nature. Made by expert teachers. Spores__ __- parts of fungi and protozoa that can disperse to spread the pathogen. 4. For webquest or practice, print a copy of this quiz at the Biology: Infectious Disease webquest print page. This can prevent a pathogen spreading around the plant, Tylose formation – tylose is a balloon like swelling or projection that fills the xylem vessel, when fully formed it can completely block off that part of the xylem vessel. Disease Communicable disease are caused by pathogens (viruses, bacteria, fungi & protoctista) and can be transmitted from one person to another. and prevent diseases 3.2.1 (i) Research the precautions taken to reduce the spread of resistant bacteria in hospitals (g) Discuss how pathogens cause communicable diseases 3.2.1(a) Outline the modes of action of antibiotics on bacteria (g) Outline the use of antibiotics in the treatment of communicable diseases … Biodiversity. Primary defences are the defences in place that prevent pathogenic material from entering the body. Deposition of callose between the plant cell wall and cell membrane near the pathogen. If you want to know more about measles then this video is the one to watch (don't worry you will not need to know all of this for the syllabus, its just an interesting video!) Inflamation – the tissue may be hot and painful as the presence of harmful microorganisms has been detected by mast cells which release a cell signalling substance called histamine which causes vasodilation to make the capillary walls more permeable to white blood cells and proteins. A Level Biology. OCR (A) A-Level Biology We have worked hard to compile every past paper by topic and exam board! However, some mutations result in the creation of a protein that provides an advantage to an organism. Certain living conditions can make transmission mo… The female reproductive system is protected by a mucus plug in the cervix and by maintaining relatively acidic conditions in the vagina. Log In Sign Up. Factsheets, Articles, PowerPoints, Revision Notes and Practice Questions for OCR (A) A Level Biology: Module 4: Biodiversity, Evolution and Disease. J" ��`��הgM���y�m)N�@MqzG�,fS�S �,���3n Communicable disease are caused by pathogens (viruses, bacteria, fungi & protoctista) and can be transmitted from one person to another. %���� ... OCR A Level Maths. Summary - Revision powerpoint on variation and inheritance ocr a level biology 2015 22. 1.1 shows a student’s diagrams of two plant cells. Some antibodies bind to molecules that are release by pathogenic cells. If there are any particular communicable diseases that you need to know the symptoms of, it will be right there in the specification. Communicable disease are caused by pathogens; bacteria, fungi and viruses. A-Level Science Articles ... A-Level Science Articles. The textbook makes a big deal out of explaining both of them as separate things, but the revision guide just explains the immune response as one process in less detail rather and doesn't differentiate between the two responses. tetanus, Herd vaccination – providing the vaccine to all or almost all of the population so that the pathogen cannot spread, it is necessary to vaccinate 80 – 95% of the population to completely immunise the population. These random mutations are more likely to occur if you are exposed to mutagenic agents, which can interfere with DN… Pure 1; Pure 2; Pure 3; Mechanics 1; Mechanics 2; Statistics 1; Statistics 2; Biology. Biology GCSE 9-1. Best CBD Oil for Anxiety. ̪hV�=L����gK�h���qv�T�8�v����V' If you want to practice more A Level Biology questions you acn always have a go at our OCR A Level Biology revision materials. Some pathogens, like the protoctista plasmodium that causes malaria, use vectors for transmission. Summary - Revision powerpoint on communicable disease ocr biology a level 2015 21. You could use them to build a mindmap, make a key word glossary or simply annotate them so you understand them in your own way. the HIV virus binds to the CD4 and CCR5 receptors on T helper cells. Communicable Diseases Organisms that cause disease Pathogen – a microorganism that causes disease Transmission of Pathogens Lifecycle of a pathogen: Travel from one host to another (transmission) Entering the hosts tissues Reproducing Leaving the hosts tissues Direct Transmission Overcrowding, poor ventilation, poor health, poor diets, homelessness and living and working with … AS Level Biology A H020/02 Depth in biology Tuesday 6 June 2017 – Afternoon Time allowed: 1 hour 30 minutes You may use: • a scientific or graphical calculator • a ruler (cm/mm) *6814887288* OCR is an exempt Charity *H02002* 2 OCR 2017 Answer all the questions. Banner 4 B 7.4 Diet, exercise, and disease AQA GCSE Biology B7 Non-Communicable Disease: Page no. hep B, Toxoids – harmless version of a toxin e.g. So if you’re revising Cell Structure for AQA GCSE Biology, you can find all of the Cell Structure questions that have been ever asked by AQA in one single document - useful, no? 2x sold. We have worked hard to compile every past paper by topic and exam board! Revise monitoring and maintaining health for communicable diseases for GCSE Biology with BBC Bitesize. Notes for the OCR A Level Biology module: Module 4: Biodiversity, Evolution and Disease. Proliferation occurs once the correct lymphocytes have been activated. The antigens on the pathogen are presented on the pathogens cell membrane as it travels in the body fluids, on infected cells, and on the plasma membrane of macrophages that have engulfed the pathogens during the secondary non-specific response. Learn about Communicable Diseases (OCR A level Biology A from 2015) with flashcards, quizzing, and games. Evolution. A-level October Exam Discussions 2020 show 10 more Help Needed For Immunology Revision (Biology) OCR AS A BIOLOGY BREADTH PAPER 25th May 2017 The detection of the pathogenic antibodies triggers clonal expansion in both T and B cells. A Level Biology. Archived. Come from the bone marrow and develop in the thymus, T helper cells (Th) – release cell signalling molecules (cytokines) that stimulate the immune response of B cells to develop and stimulate phagocytosis by phagocytes, T killer cells (Tk) – attack and kill host-body cells that display the foreign antigen as well as infected body cells, T memory cells (Tm) – provide long term immunity by staying in the blood for a long time, T regulator cells (Tr) – inhibit and end the immune response, preventing autoimmunity, They are involved in cell-mediated response (combat microorganisms), They are a complementary shape to the antigen of pathogens and once the T cell has found a complementary antigen clonal expansion takes place produced by mitosis, Plasma cells – derived from the B lymphocytes, these cells manufacture antibodies, B memory cells – cells that remain in the blood for a long time, providing long-term immunity, They are involved in the humoral response (producing antibodies), Macrophages release monokines which attract neutrophils (by chemotaxis – the movement of cells towards a particular chemical) and stimulate differentiation of B cells (and the release of antibodies), T cells and macrophages release interleukins which stimulate clonal expansion (proliferation) and the differentiation of B & T cells, Many cells release interferon which inhibits virus replication and stimulates T killer cells, A disease that occurs when the immune system attacks a part of the body, Arthritis – a painful inflammation of a joint that starts with antibodies attacking the membranes around the joint, Lupus – swelling and pain in any part of the body, antibodies attack certain proteins in the nucleus of cells and affected tissue. For OCR A Biology and other specifications. These have been made according to the specifications (H020, H420, H021, H421) and cover all the relevant topics for examination in May/June. Controlling communicable diseases About this site. Press question mark to learn the rest of the keyboard shortcuts. 1. Hating biology a-level A-level Autumn Resits 2020 MEGATHREAD! About this quiz: All the questions on this quiz are based on information that can be found at Biology: Infectious Disease. It is specifically caused by the bacterium vibrio cholerae which is a gram-negative bacteria. Biology drawing skills handbook This guide will support students in developing their biological drawing skills. Direct transmission- touching, kissing, contact with cuts in skin and sexual contact 2. We provide detailed revision materials for A-Level Biology students and teachers. Edexcel Biology. 36 items . STUDY. Please consider whitelisting us on your ad blocker, or making a donation. Write. 4.1.1 Communicable diseases, disease prevention and the immune system has many synoptic links with the earlier teaching Module 2: Foundations in biology, particularly 2.1.1 Cell structure, and 2.1.5 Biological membranes. Antibodies that cause the pathogens to stick together (agglutinate) by making crosslinks between their antigens, This makes the pathogen non-effective and easily phagocytosed. User account menu. Bacteria and viruses are the main disease causing pathogens in humans. Fungi. 107 1. people who exercise regularly are usually healthier than people who take little exercise because regularly exercising people make bigger muscles, up to 40% of their body mass, and muscle tissue needs much more energy to be transferred from food than body fat. OCR Biology A: Communicable Diseases. bacteria - cause communicable disease. Biology AS/A Level OCR Flashcards Decks in this Class (26): 31 Exchange Surfaces And Breathing. 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